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Islam is a perfect religion. Since its inception fourteen centuries ago, Islam has provided mankind with a comprehensive solution to all the problems that are and will be faced by mankind. The manifestation of the perfection of Islamic teachings includes, among others, Islam not only regulates the relationship between human beings and gods in matters of worship, but also Islam also regulates and resolves the problems of human relations with themselves and others. Both in the case of muamalah in the form of rules in the fields of economy, politics, government, education, social to uqubat. The Ottoman Caliphate was the strongest Islamic state at the time, the glory of the Ottoman Caliphate was a manifestation of its proximity to Islamic law. During his reign, the Ottoman caliphate made many glorious victories, one of which was the conquest of the city of Constantinople (the dream city of the world at that time). This paper tries to examine the perfection of Islamic rules, the application of which will bring progress for rahmatan lil alaamin. Using the historical-analysis method, this study seeks to review the rise of the Ottoman Caliphate with the application of Islamic Sharia. Through this study, the author wants to prove that a civilization will experience a heyday when it makes the Islamic yariat as a whole a rule in the state.